It’s fantastic! A mixture of cold-war history and eerie emergent network effects:

It didn’t take very long before we started seeing all sorts of wonderful properties in this model. The network would learn where everybody was. You could chop up the network and within half a second of real-world time it would be routing traffic again. Then we had the realization that if there’s an overload in one place, traffic will move around it. So it’s a lot more efficient than conventional communications. If somebody tries to hog the network, the traffic routes away from them. Packet switching had all these wonderful properties that weren’t invented — they were discovered.